Accounts Receivable and Major Customers - Additional Information (Detail) $ in Thousands	12 Months Ended
	Dec. 31, 2017 USD ($) Customer	Dec. 31, 2016 USD ($) Customer
Accounts, Notes, Loans and Financing Receivable [Line Items]
Customers	$ 39,106	$ 20,489
Successor [Member] | Sales Revenue | Customer Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Number of major customers | Customer	3	3
Revenues, major customers	$ 137,500	$ 122,700
Concentration risk, percentage	86.00%	93.00%
Successor [Member] | Sales Revenue | Customer Concentration Risk | Major Customer 1
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	$ 94,100	$ 93,500
Concentration risk, percentage	59.00%	71.00%
Successor [Member] | Sales Revenue | Customer Concentration Risk | Major Customer 2
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	$ 22,100	$ 15,700
Concentration risk, percentage	14.00%	12.00%
Successor [Member] | Sales Revenue | Customer Concentration Risk | Major Customer 3
Accounts, Notes, Loans and Financing Receivable [Line Items]
Revenues, major customers	$ 21,300	$ 13,500
Concentration risk, percentage	13.00%	10.00%
Successor [Member] | Accounts Receivable | Credit Concentration Risk
Accounts, Notes, Loans and Financing Receivable [Line Items]
Concentration risk, percentage	82.00%	81.00%
Accounts receivable, major customers	$ 32,100	$ 16,700